00521naa#a2200145#i#450# EN\\bibl\67057 20251221234029.7 2712-7761 20230630b2023####ek#y0engy0150####ca RU Coryphaeus of coal geology The 100th anniversary of the birth of Yuri Vasilyevich Stepanov Journal article Syktyvkar FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences" 2023 0 с. Journal article local komisc.editorum.ru